<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <button>点击</button>
    <script>
      var btn = document.querySelector("button");
      //   btn.onclick = function () {
      //     console.log(111);
      //   };
      //   btn.onclick = function () {
      //     var e = event || window.event;
      //     console.log(e);
      //   };
      //   document.onwheel = function (event) {
      //     var e = event || window.event;
      //     console.log(e);
      //   };
      //   document.oncontextmenu = function (event) {
      //     var e = event || window.event;
      //     console.log(e);
      //   };
      //   点击滚轮触发滚轮点击事件
      document.onmouseup = function (e) {
        console.log(e);
      };
    </script>
  </body>
</html>
